- Voice Actor (CV)
- Ai Kayano
- Role
- Supporting
- Identity
- A high school transfer student and the biological older sister of protagonist Aki Shiina, who later enrolls at the same school as Nana Sunohara
Personality
brother-obsessed
overprotective
childlike beneath a calm exterior
chronically directionally challenged
Despite her composed appearance, Matsuri Shiina harbors an almost obsessive affection and possessiveness toward her younger brother Aki, going so far as to attempt dragging him back home. Beneath her seemingly mature demeanor lies a surprisingly childlike personality, compounded by a notoriously terrible sense of direction that leads to countless everyday mishaps. It was only after witnessing Ayaka Sunohara's devoted and attentive care for Aki that Matsuri finally let go of her overprotective instincts and allowed him to remain at Sunohara-sou.